document.write( "Question 141335: The intake pipe can fill a tank in 4 hours when the outlet pipe is closed, but with the outlet pipe open it takes 6 hours. How long would it take the outlet pipe to empty a full tank? \n" ); document.write( "
Algebra.Com's Answer #102976 by scott8148(6628)\"\" \"About 
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in 6 hrs, the inlet pipe can fill the tank to 150% (6/4)
\n" ); document.write( "__ this means that 50% of the volume went through the outlet in 6 hrs
\n" ); document.write( "__ 50% in 6 hrs means it takes 12 hrs for the outlet to empty the tank\r
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\n" ); document.write( "\n" ); document.write( "the equation __ let x=\"outlet time\" __ 6/4-6/x=1\r
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\n" ); document.write( "\n" ); document.write( "multiplying by 4x __ 6x-24=4x __ 2x=24 __ x=12
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